Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 * Author: Mattias Nilsson <mattias.i.nilsson@stericsson.com> for ST Ericsson.
4 * License terms: GNU General Public License (GPL) version 2
5 */
6
7#include <linux/err.h>
8#include <linux/module.h>
9#include <linux/platform_device.h>
10#include <linux/mfd/abx500.h>
11#include <linux/mfd/abx500/ab8500.h>
12#include <linux/mfd/abx500/ab8500-sysctrl.h>
13
14static struct device *sysctrl_dev;
15
16static inline bool valid_bank(u8 bank)
17{
18 return ((bank == AB8500_SYS_CTRL1_BLOCK) ||
19 (bank == AB8500_SYS_CTRL2_BLOCK));
20}
21
22int ab8500_sysctrl_read(u16 reg, u8 *value)
23{
24 u8 bank;
25
26 if (sysctrl_dev == NULL)
27 return -EAGAIN;
28
29 bank = (reg >> 8);
30 if (!valid_bank(bank))
31 return -EINVAL;
32
33 return abx500_get_register_interruptible(sysctrl_dev, bank,
34 (u8)(reg & 0xFF), value);
35}
36
37int ab8500_sysctrl_write(u16 reg, u8 mask, u8 value)
38{
39 u8 bank;
40
41 if (sysctrl_dev == NULL)
42 return -EAGAIN;
43
44 bank = (reg >> 8);
45 if (!valid_bank(bank))
46 return -EINVAL;
47
48 return abx500_mask_and_set_register_interruptible(sysctrl_dev, bank,
49 (u8)(reg & 0xFF), mask, value);
50}
51
52static int ab8500_sysctrl_probe(struct platform_device *pdev)
53{
54 sysctrl_dev = &pdev->dev;
55 return 0;
56}
57
58static int ab8500_sysctrl_remove(struct platform_device *pdev)
59{
60 sysctrl_dev = NULL;
61 return 0;
62}
63
64static struct platform_driver ab8500_sysctrl_driver = {
65 .driver = {
66 .name = "ab8500-sysctrl",
67 .owner = THIS_MODULE,
68 },
69 .probe = ab8500_sysctrl_probe,
70 .remove = ab8500_sysctrl_remove,
71};
72
73static int __init ab8500_sysctrl_init(void)
74{
75 return platform_driver_register(&ab8500_sysctrl_driver);
76}
77subsys_initcall(ab8500_sysctrl_init);
78
79MODULE_AUTHOR("Mattias Nilsson <mattias.i.nilsson@stericsson.com");
80MODULE_DESCRIPTION("AB8500 system control driver");
81MODULE_LICENSE("GPL v2");